Mantle head



Oct. 18, 1932. c, w, DAVIS 1,883,602

MANTLE HEAD Original Filed July 25. 1927 A TTORNE y L ings at thePatented Qct. 18, 1932 uNsiTEn srATss PATENTTOFFICEQ CORTLAND W. DAVIS,0F OAK PARK, ILLINOIS, ASSIGNOR IO THE MANTLE LAMP COMPANY OF AMERICA,OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS MAN'ILE HEAD Originalapplication filed. July 25, 1927, Serial No. 208,286. Divided and thisapplication filed November 12, 1928. Serial no. 318,874.

This application is a division of the application ofCortland W. Davis,#208,286, for a blue-flame mantle'lamp, filed July 25, 1927, in whichare revealed several improvements all of which co-operate to control thefunctioning of the burner with which a lamp of that type is provided,whereby it is possible to reduce the creeping or working-up tendency ofthe flame, to obtain a full light from the lamp in a short period oftime, and to render the operation of the lamp stable and reliable.

Among these several features of construction are a new chimney and, itsretaining means, a new fiamespreader, a new burnercone construction, anew flame-protecting baflie, a new mantle head and a new mantlesupporting means. The disclosure and the claims of this applicationrelate to the mantle head.

The invention relates to heads for mantles such as are used withblue-flame lamps, objects of the invention being to secure uniformity inthe cross-sectional areas of openupper extremities of all mantles,whereby the drafts of various lamps will not be controlled bydifferences in the sizes of such openings, and also to prevent themantle from rising.

In the operation of blue-flame mantle lamps, it is very important thatthe mantles be of uniform size and shape. openings through the meshesthe single opening at the head of the mantle, constitute ports throughwhich the escaping products of combustion must pass, and hence it isdesirable that said single opening, which is the principal port of exitfor said products of combustion, shall be of a maintainablepredetermined and adequate size. The invention includes means forattaining this object, the head of the mantle being made of some metalthat is unaffected by the heat of the burner and which can be given adefinite size and shape.

The invention will be understood if the following specification isconsidered in connection with the accompanying drawing, in

which- The many Figure 1 is a top elevation showing the construction ofthe mantle head;

Figure 2 is a sectional view of the mantle head Figures mantle head.

The mantle head (Figures 1, 2, 3, 4, 5) is produced from a flat strip ofmetal (Figure 3) having preferably square holes 61, which, after beingbent toll-shape (Figure 4), is curved to constitute a ring 62 having agroove 63 (Figures 2, 5). This ring, because of its v'eshape, is capableof being flattened This device is provided with a sustaining strip 64fashioned at its ends 65 to embrace at 66, the lower edge of said ring62, said ends being preferably disposed within said ring so that theupper edge 67 of the mantle 30 and its retaining cord 68 may be placedand held within said groove 63. After the upper'edge 67 of the mantle 30is secured by the cord 68 in the groove 63 the metal ring 62 ispreferably flattened in order to securely hold the said upper edge ofthe mantle 30 to the metal ring 62. The strip 6% is bent at its middlepart 69 to receive the V mantle-sustaining wire 31, this part preferablyconstituting an eye which encircles the supporting wire 31 and preventsthe mantle from rising.

A mantle having a head thus constructed, Will possess an outlet port ofdeterminate ize and shape which permits the free outflow of the productsof combustion and generally improvesthe draft of the lamp. Furthermore,this construction makesit possible to so standardize all mantles thattheir outlet ports will beuniform. If,as heretofore, the sizes of theoutlet ports of mantles vary, the operations of lamps in which they areused will lack uniformity. By making all mantles identical, at leastinsofar as their outlet ports are concerned, this difficulty issubstantially overcome.

The use of a strip of metal in the formation of the head of a mantle isadvantageous because the metal strip is stronger than as-' bestos cordcommonly used for such purposes, and because a lesser quantity ofthoriaimpregnated fabric is used in the formation 3, 4: and 5 are detailviews of the of such a mantle head and the hardening of the thoria partof the mantle head during the manufacture of the mantle is renderedeasier and more certain.

The method of producing a metal mantle head, herein disclosed, in Whicha perforated metal strip is used, permits the use of a minimum quantityand Weight of metal in the formation of such a head. Heretofore metalmantle heads have been employed, but such heads have included arelatively large mass of metal, the momentum of which often caused arupture at the junction of the metal and thoria structure of the mantle.By making the metal head from a perforated strip of metal, the mass ofmetal used in the head and its momentum are so reduced as to avoid thisdifficulty. Metal mantle heads, made according to this invention Weighless than the asbestos cord heretofore used in making mantle heads ofthe same size.

By the use of metal in the manufacture of the mantle head, it becomespossible to employ automatic machinery in the fabrication of such heads,and, as a consequence, to ma terially cheapen the cost of making mantleheads as compared with the ordinary method wherein mantle heads are madeby skilled workers and the heads are entirely formed by sewing and tyingwith an asbestos cord or the like. The metal head, constituting thepresent invention, retains its configuration throughout the operation ofmaking the mantle, and is not Warped or distorted in the finalmantle-calcining operation, as it is the case of the asbestos-sewedmantle heads.

Having thus described my invention, What I claim is:

1. A mantle combined With an externallyrecessed annulus in which theupper edge of the mantle is secured, said annulus being a curved stripof metal having continuous edges.

2. A head for an incandescent mantle comprising a perforated circularstrip of metal having continuous edges and external means for thereception of the top of the mantle and a supporting element extendingacross said head.

3. A mantle combined With a metal annulus having an external recess inwhich the upper edge of the mantle is disposed, and a cord retainingsaid upper edge in said recess, said annulus being a curved strip ofmetal having continuous edges.

4. An annular mantle head comprising a V-shaped strip of metal havingcontinuous edges and which is capable of being flattened.

5. A mantle head consisting of a curved metallic strip having continuousedges and provided with spaces, combined With a mantle secured at itsupper end to said head.

In testimony whereof I affix my signature.

CORTLAND W. DAVIS.

